I read the book back in the early 2000s, but didn't do any subscriptions. The principles stick once you incorporate them. The big thing is to schedule in time to review 30,000 ft, 10,000ft, and 1000 ft goals and tasks. I also place calendar, goal, and task reviews into my weekly agenda to force review. It has allowed me to manage the equivalent of 3 full-time jobs at times.